Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1988-08-29
1990-01-30
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411544, 411909, F16B 3300, F16B 4302
Patent
active
048970069
ABSTRACT:
Shape memory alloy spring washers passing from a flat shape to a truncated cone shape on exceeding a given critical temperature (Tc) can be stacked in opposition or in the same sense with identical and/or different washers, in order to bring about a development in stages of the pressure (P) applied by the stack of washers when the temperature (T) varies. These washers can advantageously be used for the bonding and polymerization of composite material parts (C), because they make it possible to simultaneously treat several parts in the same ventilated oven and in a less expensive manner.
REFERENCES:
patent: 3613732 (1971-10-01), Willson et al.
patent: 4159483 (1979-06-01), Bettin
patent: 4720223 (1988-01-01), Neights et al.
patent: 4747739 (1988-05-01), Bowman et al.
Article: "Alloys With Two Way Shape Memory Effect", Mechanical Engineering, vol. 102, Mar. 1980.
Article: "Master the Mysteries of Spring Washers", Product Engineering, vol. 50, No. 6.
Aerospatiale - Societe Nationale Industrielle
Wilson Neill R.
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